class StudentV1:
    def __init__(self,name,age,student_id):
        self.name=name
        self.age=age
        self.student_id=student_id
class StudentV2(StudentV1):
    def __init__(self,name,age,student_id,grade,mobile):
        StudentV1.__init__(self,name,age,student_id)
        self.grade=grade
        self.mobile=mobile
    def get_info(self):
        print("今年上",self.grade)
        print("我的电话是：",self.mobile)

ming=StudentV2("liming","15","001","一年级","13065213025")
ming.get_info()